Plot bar chart with log scale on y axis

I want to plot a group bar chart with differences about 10^-4 within the data, positiv and negativ. So the problem is, either I get a bar chart where just the big values are visible and the small ones disappear, or there is some trouble about plotting negative/postitiv data on a log scale.

I tried to add

set(axes1,'YScale','log')

in my code, but it doesn't work as expected, and i dont know which other options i got.

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